许天寒,赵文桦,王浩南,张元庆,孙美凤,胡野
XU Tianhan,ZHAO Wenhua,WANG Haonan,ZHANG Yuanqing,SUN Meifeng,HU Ye

• 1:中国石油大庆油田有限责任公司勘探开发研究院
• 2:多资源协同陆相页岩油绿色开采全国重点实验室

摘要(Abstract)：

为解决页岩油藏CO_2吞吐中驱油效果与封存性能协同调控难题，明确含油饱和度对储层孔隙结构、渗透率及原油组分迁移的定量调控机制，以吉木萨尔凹陷芦草沟组页岩为研究对象，制备高（含束缚水）、中（50%）、低（25%）含油饱和度岩心，在模拟实际油藏条件（温度90℃、压力45 MPa）下开展CO_2高压吞吐实验，结合孔渗联测、原油碳组分分析及低场核磁共振探究含油饱和度对储层孔隙结构、渗透率及原油组分迁移的协同响应规律。结果表明：在CO_2吞吐实验过程中，高含油饱和度岩心孔隙度、渗透率持续下降，反应240 h后分别下降13.0%～13.9%、30.6%～33.3%；中含油饱和度岩心孔隙度、渗透率呈“先增后降”趋势，反应24 h后分别上升8.5%～8.6%、12.4%～14.1%，反应240 h后分别下降1.2%～1.3%、3.8%～8.6%；低含油饱和度岩心孔隙度、渗透率持续上升，反应240 h后分别上升13.2%～16.5%、51.6%～51.8%；随着含油饱和度的降低，CO_2对原油中轻质与中质组分的萃取效率显著提升，中、低含油饱和度岩心轻质组分含量（体积分数）最终分别达12.6%、13.9%；高含油饱和度岩心大孔信号占比从63.2%降至35.4%，低含油饱和度岩心从54.2%升至55.6%。研究成果可为页岩油藏CO_2驱油效率优化及地质封存安全性评价提供实验依据与技术支撑。
To address the challenges in synergistic regulation of displacement efficiency and storage performance during CO_2 huff-and-puff in shale reservoirs, and to clarify the quantitative controlling mechanisms of oil saturation on reservoir pore structure, permeability and oil component migration, shale cores from Lucaogou Formation of Jimsar Sag are taken as research object to prepare core samples with high(containing irreducible water), medium(50%), and low(25%) oil saturation. High-pressure CO_2 huff-and-puff experiments are conducted in simulated reservoir conditions(90°C, 45 MPa). By integrating porosity-permeability measurements, analysis of carbon component in oil and low-field nuclear magnetic resonance, the synergistic response patterns of oil saturation reservoir pore structure, permeability and oil component migration are explored. The results show that, during the process of CO_2 huff-and-puff experiment, high oil-saturation cores exhibit continuous decline in porosity and permeability, decreasing by 13.0%-13.9% and 30.6%-33.3% after 240 hours, respectively. Medium oil-saturation cores demonstrate an initial increase in porosity and permeability, increasing by 8.5%-8.6% and 12.4%-14.1% after 24 hours, respectively; followed by declines of 1.2%-1.3% and 3.8%-8.6% after 240 hours, respectively. Low oil-saturation cores show continuous growth in porosity and permeability, increasing by 13.2%-16.5% and 51.6%-51.8% after 240 hours, respectively. With the decrease of oil saturation, CO_2 extraction efficiency for light/medium components significantly increased, with final light component content(volume fraction) in medium/low oil-saturation cores reaching 12.6% and 13.9%, respectively. The large-pore signal proportion decreases from 63.2% to 35.4% in high oil-saturation cores, while increasing from 54.2% to 55.6% in low oil-saturation cores. The research provides experimental basis and technical support for optimizing CO_2 flooding efficiency and evaluating geological storage safety in shale oil reservoirs.

关键词(KeyWords)： 页岩油藏;含油饱和度;CO_2吞吐;孔隙结构演化;原油组分迁移
shale oil reservoir;oil saturation;CO_2 huff-and-puff;pore structure evolution;oil component migration

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大科技专项“陆相页岩油规模增储上产与勘探开发技术研究”（2023ZZ15）

作者(Author): 许天寒,赵文桦,王浩南,张元庆,孙美凤,胡野
XU Tianhan,ZHAO Wenhua,WANG Haonan,ZHANG Yuanqing,SUN Meifeng,HU Ye

DOI: 10.19597/J.ISSN.1000-3754.202509030

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